idx doesn't detect TypeErrors in german IE

[keesvanlierop]

Related to #46 , A german error can look like this:

Die Eigenschaft "addresses" eines undefinierten oder Nullverweises kann nicht abgerufen werden.

This does not pass the regex test and therefore gets thrown in the console.

[petetnt]

Same with Finnish IE11: The error message in finnish is Määrittämättömän tai tyhjän viittauksen ominaisuutta... for Unable to get property 'biz' of undefined or null reference

[petetnt]

As a workaround the babel transform and the macro (https://github.com/dralletje/idx.macro) work well because the values get precomputed!

[yungsters]

I've updated the README.md to mention that babel-plugin-idx is critical to correct behavior of idx. Thanks for reporting this.